Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «A»:
Agammaglobulinemia is an inherited disorder in which there are very low levels of protective immune system proteins called immunoglobulins. People with this disorder repeatedly develop infections.
Agammaglobulinemia is a rare disorder that mainly affects males. It is the result of a genetic ...
Age-appropriate diet for children
An age-appropriate diet is one that provides adequate nutrition and is appropriate for a child's state of development.
BIRTH TO 4 MONTHS OF AGE
During the first 4 - 6 months of life, infants need only breast milk or formula to meet all their nutritional needs.
If breastfeeding, a ne...
Age-related hearing loss
Age-related hearing loss, or presbycusis, is the slow loss of hearing that occurs as people get older.
Tiny hairs inside your ear help you hear. They pick up sound waves and change them into the nerve signals that the brain interprets as sound. Hearing loss occurs when the tiny hairs inside ...
Aging changes in body shape
Many people are concerned with changes in their body shape as they age. Although some changes inevitably occur with aging, your lifestyle choices may slow or speed up these changes.
The human body is made up of fat, lean tissue (muscles and organs), bones, water, and other substances. As we age, the...
Aging changes in hair and nails
Hair color change is probably one of the most obvious signs of aging. Hair color is caused by a pigment (melanin) produced by hair follicles. With aging, the follicle produces less melanin.
Graying often begins in the 30s, although this varies widely. Graying usually begins at the temples and extend...
Aging changes in hormone production
The endocrine system is made up of organs and tissues that produce hormones. Hormones are natural chemicals produced in one location, released into the bloodstream, then used by other target organs and systems.
The hormones control the target organs. Some organ systems have their own internal contro...
Aging changes in immunity
The thymus, one of the organs of the immune system, is the site where certain immune cells called T lymphocytes (T cells) mature. The thymus begins to shrink (atrophy) after adolescence. By middle age it is only about 15% of its maximum size.
Some of the T cells directly kill foreign part...
Aging changes in organs - tissue - cells
All vital organs begin to lose some function as you age. Aging changes have been found in all of the body's cells, tissues and organs, and these changes affect the functioning of all body systems.
Living tissue is made up of cells. There are many different types of cells, but all have the same basic...
Aging changes in skin
Aging changes in the skin are a group of common conditions and developments that occur as people grow older.
Skin changes are among the most visible signs of aging. Evidence of increasing age includes wrinkles and sagging skin. Whitening or graying of the hair is another obvious sign of...
Aging changes in sleep
Sleep occurs in multiple stages. The sleep cycle includes dreamless periods of light and deep sleep, with occasional periods of active dreaming (REM sleep). The sleep cycle is repeated several times during the night.
With aging, sleep patterns tend to change. Most people find that agin...
Aging changes in the bones - muscles - joints
Changes in posture and gait (walking pattern) are as universally associated with aging as changes in the skin and hair.
The skeleton provides support and structure to the body. Joints are the areas where bones come together. They allow the skeleton to be flexible for movement. In a joint, bones do n...
Aging changes in the breast
With aging, a woman's breasts lose tissue and subcutaneous fat, reducing breast size and fullness. There is also a decrease in the number of mammary glands, which the body replaces with fat tissue. These changes make the breast less firm. The breasts lose support.
Aging breasts commonly flatten and ...
Aging changes in the face
The typical appearance of the face and neck changes with age. Muscle tone may be lost, causing a flabby or droopy appearance. The jowls may begin to sag, leading to a "double chin" in some people. In some people the nose lengthens slightly and may look more prominent.
There also may be an increase i...
Aging changes in the female reproductive system
As a woman ages, a number of changes take place in the female reproductive system. For women, the cessation of menses (menopause) is an obvious sign of aging. But, it is by no means the only change. A transition period, called the climacteric, lasts for many years before and after a woman's last men...
Aging changes in the heart and blood vessels
Some changes in the heart and blood vessels normally occur with age, but many other changes that are common with aging are due to modifiable factors that, if not treated, can lead to heart disease.
The heart has two sides. The right side pumps blood to the lungs to receive oxygen and get ...